False twisted ribbons

ABSTRACT

False twisting ribbons of from 100 to 2,000 denier using a mechanical false twisting spindle rotating at from 10,000 to 500,000 r.p.m. to produce a false twisted ribbon in which the ribbon is longitudinally folded on itself from both sides but contains substantially no twist but rather has embossed striations which give the appearance of a twist.

Q United States Patent [151 3,646,747

Strohmaier 1 Mar. 7, 1972 [54] FALSE TWISTED RIBBONS 3,126,699 3/ 1964 Lefevre et al. ..57/ 167 X 3,500,626 3/1970 Sandiford [72] Inventor. Alfred J. Strohmaler, Seaford, Del. 3,194,716 7/1965 Lefevrenm [73] Assignee: E. l. du Pont de Nemours and Company, 3,503,106 3/1970 Port et a1. ..57/ 140 X Wilmington, Del. FOREIGN PATENTS 0R APPLICATIONS [22] Filed: Aug. 1, 1969 960,067 6/ 1964 Great Britain ..57/ 167 [211 App]. No.: 846,711

Primary Examiner-Donald E. Watkins [52] US. Cl ..57/l40, 57/155, 57/157, Amr'ley-Robel1 Kline 57/167 [51] Int. 02g 3/06 ABSTRACT [58] FieldofSearch ..57/31,77.3,151,140,167, False wisfin g ribbons of from 100 to 2,000 denier using a 57/55 165 mechanical false twisting spindle rotating at from 10,000 to 56] R mes Cited 500,000 rpm. to produce a false twisted ribbon in which the l e ribbon is longitudinally folded on itself from both sides but UNITED STATES PATENTS contains substantially no twist but rather has embossed striations which give the appearance of a twist. 3,053,038 9/1962 Weiss et a1. ..57/77.3 X 3,112,600 12/1963 Stoddard et a1 ..57/77.3 X 5 Claims, 5 Drawing Figures PAIENTEDHAR 7 1972 ,5 5,7 7

ZNVENTOR ALFRED J. STROHMAIER ATTORNEY BACKGROUND OF THE INVENTION The present invention relates to certain false twisted ribbons and to the process of producing such ribbons.

FIG. 4 is a plan view of a false twisted ribbon.

FIG. is a plan view of another false twisted ribbon.

As shown in FIG. I, the ribbon I is fed from supply package 2 to disk tensioners 3 and 4 to feed rods 5 and 6 across heated In the past, false twisted yarns have been prod d accord 5 metal plate 7 through twisting spindle 8 through traverse 9 and ing to the techniques set forth in US. Pat. No. 3,279,164 is- 5 by z g f f" by E Sued Bree iii fiirliel s' ieiis bi rne23 iiiil sn'riilfe'r'r iiis 8231 SUMMARY OF THE INVENTION stant, are normally used in the performance of this invention.

The present invention involves running a ribbon through a 10 Due 10 their COmPIeX nature, and Since the il of h mechanical false twisting apparatus run t a l tivel l drives are not part of this invention, such a drive is not shown speed and the resultant product which is afolded ribbon havhefe- Spindle 8 is driven y p y- Generally, Spindle 8 is ing substantially straight sides with twist appearing striations drive" at a speed of from 10,000 to 500900 -P- -r and on h rfa fth ibb preferably from 34,000 to 142,000 rpm, and the ribbon is Preferred ribbons are from 100 to 2,000 denier and have a 1 fed at from 30 to 300 yards p minute to Provide to 50 i h off om 1() to 200 1 turns per inch of twist. The false twisting spindle 8 is shown in The process of this invention is useful for treating ribbons of greater detail in the ribbon is pp once any natural or synthetic filamentary material with the around -P as it P through Spmdle synthetic thermoplastic resins such as polyamides, polyesters DESCRIPTION OF THE PREFERRED EMBODIMENTS and polymers of acrylonitrile being preferred. Suitable polymers can be found among the fiber forming polyamides A Superloft No. 550 machine in Example 1-10 and a and polyesters which are described in U.S. Pat. Nos. Superloft"No. 552 machine in Example 11 is set up asshown 2,071,250; 2,071,253; 2,130,523; 2,130,948; 2,190,770 and in FIG. 1. The operating conditions used and properties of the 2,465,319. The preferred group of polyamides comprises such resultant product are reported in Table I. In each of Examples polymers as poly(hexamethylene adipamide), poly(hexl-10 the ribbons were formed of a copolymer of 90 mole peramethylene sebacamide), poly(epsilon caprolactam), and the cent hexamethylene diamine and adipic acid and 10 mole percopolymers thereof. Among the suitable polyesters are cent caprolactam commonly referred to as a 90/ 10 66/6 poly( ethylene terephthalate) and the corresponding copolyamide, which ribbons were 1 mil thick and of the width copolymers containing sebacic acid, adipic acid, or isophthalrequired to correspond to the denier indicated in Table I. In ic acid as well as the polyesters containing recurring units Example ll,the ribbon was 150 gauge by 1/64 inch wide Luderived from glycols with more than two carbon atoms such as rex MM blue which is a ribbon 1.5 mils in thickness made diethylene glycol, butylene glycol and decamethylene glycol. from metallized polyethylene terephthalate. In each case the copolymers of hexamethylene diamine nd il n caprolacfalse twisted product was a somewhat flattened hollow tube tam containing from 75 to 95 er t h thyl di i with embossed striations to give the appearance of a twist as and from 25 to 5 percent epsilon caprolactam are especially Shown in FIG. 4. When higher numbers of nominal twists per preferred. 7 A W V inch were used, it was necessary to apply tension to avoid ob- The false twisting of the present invention is carried out by taining a product which is a hollow tube with definite alternatfeeding the ribbon from whatever it is stored on, such as a ing Sand Z" twists.

TABLE I Denier Nominal Windup Over Spindle Plate Denier Break Tena ity. Break (supply), twist/ speed, feed, speed, temp., (twisted), strength, s./ elongation, grns. inch y.p.rn. percent r.p.m C. grns. gms. enler percent spool or bobbin, heating the ribbon to from 15 to 85C. below Iclaim: A the crystalline melting point, running the ribbon through a l. A process of false twisting a ribbon of a synthetic thermechanical false twisting spindle operated at from 5,000 to moplastic crystalline resin which comprises the steps of (a) 500,000 rpm. and taking up the thus false twisted ribbon ona 55 heating the ribbon, which is from 100 to 2,000 denier and suitable takeup ,means such as a bobbin. The takeup means from 10 to 200 mils wide, to a temperature from 15 to 85 C. should be driven at speed within from 1 0 percent to +10 perbelow its crystalline melting point, (b) feeding the heated ribcent of the speed of the ribbon feeding means. The ribbon may bon at from 30 to 300 yards per minute around a pin mounted be heated to the desired temperature passing it over a heated in a rotating false twisting spindle operated at from 10,000 to metal plate or roll, passing it through a heated bath of liquid 500,000 revolutions per minute and (0) taking up the resulting such as water or oil or blowing a hot gas such as air on the ribfalse twisted ribbon on a takeup means whereby to produce a bon or by radiation. Due to the speed with which the ribbon is ribbon which is folded upon itself without any substantial passed over the plate, the plate is maintained at a temperature twisting. considerably higher than the temperature to which it is desired 2. The process of claim I wherein there is an overfeed from to heat the ribbon. For instance, for 500 to 900 denier ribbons l 0 to +10 percent as based on the linear takeup rate. of copolymers of hexamethyleneadipamide/caprolactam 3. The process of claim 2 wherein the ribbon is formed from which has a crystalline melting point of 265 C., the metal apolyamide. plate should be maintained at from 205 to 235C. and should 4. he proces of claim 3 er the polyam e is a be large enough to provide a 0.2 to 1.0 second residence time copolymer of hexamethylene adipamide and caprolactam of the ribbon in contact with the metal plate. containing from to percent hexamethylene adipamide and from 25 to 5 percent caprolactam. DESCRIPTION OF THE DRAWING s. A to 2,000 denier false twisted ribbon formed of a In the drawing, synthetic thermoplastic resin in which the ribbon is in the form FIG. I is a schematic drawing of the essential elements of of a flattened hollow tube having substantially straight sides the false twisting apparatus. 75 wherein the joint between the edges of the original ribbon is FIG. 2 is a perspective view of the false twisting spindle used in the apparatus of FIG. 1.

FIG. 3 is a cross section taken on line 3-3 of FIG. 4.

substantially parallel with the sides of the ribbon which ribbon has embossed striations on the surface thereof giving the appearance of a false twist. 

1. A process of false twisting a ribbon of a synthetic thermoplastic crystalline resin which comprises the steps of (a) heating the ribbon, which is from 100 to 2,000 denier and from 10 to 200 mils wide, to a temperature from 15* to 85* C. below its crystalline melting point, (b) feeding the heated ribbon at from 30 to 300 yards per minute around a pin mounted in a rotating false twisting spindle operated at from 10,000 to 500,000 revolutions per minute and (c) taking up the resulting false twisted ribbon on a takeup means whereby to produce a ribbon which is folded upon itself without any substantial twisting.
 2. The process of claim 1 wherein there is an overfeed from -10 to +10 percent as based on the linear takeup rate.
 3. The process of claim 2 wherein the ribbon is formed from a polyamide.
 4. The process of claim 3 wherein the polyamide is a copoLymer of hexamethylene adipamide and caprolactam containing from 75 to 95 percent hexamethylene adipamide and from 25 to 5 percent caprolactam.
 5. A 100 to 2,000 denier false twisted ribbon formed of a synthetic thermoplastic resin in which the ribbon is in the form of a flattened hollow tube having substantially straight sides wherein the joint between the edges of the original ribbon is substantially parallel with the sides of the ribbon which ribbon has embossed striations on the surface thereof giving the appearance of a false twist. 